Hibam d



H. n. CURRIER.

TELEPHONE SYSTEM HAVING INSTANTANEOUS DlSCONNECT AND RECALL. APPLICATIONFILED SEPT. 19. m4.

fin/527752: fiz famfl I 2111? 2'51? Patented June 17, 1919.

HIRAIVI D. GURRIER, CHICAGO, ILLINOIS, ASSIGNOR TO KELLOG-G SWITCHBOARD& SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE SYSTEM HAVING INSTANTANEOUS DI'SCONNEGT AND RECALL.

Specification of Letters Patent.

Patented June 17, 1919.

Application filed September 19, 1914. Serial No. 882,464.

To all whom it may concern.

Be it known that I, HIRAM D. GURRIER, a citizen of the United States ofAmerica, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in TelephoneSystems Having Instantaneous Disconnect and Recall, of which thefollowing is a specification.

My invention relates to telephone systems and is more particularlydesigned to provide a system with instantaneous disconnect and recallfeatures.

My invention is more particularly an improvement over my applicationSerial No. 815,123, filed Jan. 29, 1914. In my said copendingapplication I disclose a system in which a connected line may by therestoration of the switchhook cause an operative disconnection of theconnected cord circuit so that an immediate reactuation of theswitchhook actuates the line lamp irrespective of the presence of theplug of the connected cord circuit in the jack of that particular line.

My present invention concerns itself with the adaptation of a certaincharacter of telephone line circuit and cord circuit to accomplish thesame results, said line circuit be ing of an entirely differentcharacter from that disclosed in my said co-pending application.

My invention herein is adapted for use more particularly in connectionwith a line circuit where the tip side of the plug controls theeffacement of the line signal and the operation of cooperating cordcircuit instrumentalities. In my said co-pending application the linecircuit is of such a character that the functions above enumerated areaccomplished through the agency of the sleeve side of the cord circuit.In those line circuits in which the tip side of the cord circuit iscalled upon to perform the func tions aforesaid, it has hitherto beennecessary in order to obtain a busy test to actuate a manuallycontrolled key in order to obtain this busy test.

My present invention contemplates the provision of a cord circuit which,while operating in connection with the particular llne circuit referredto, obtains the busy test conditions without the use of a key and at thesame time is of such a character as to permit of the instantaneousdisconnect and recall features mentioned in my said copendingapplication.

I will explain my invention as applied to one particular form of a linecircuit more in detail by referring to the accompanying drawingillustrating the same diagrammatically. I believe a correctunderstanding of my invention will be best obtained by describing thesteps gone through in actually making a connection and the operationswhich follow as a result therefrom.

In the illustration I have shown two substations A and B as entering anexchange G at which my improved cord or link circuit is diagrammaticallyshown. Assuming that the subscriber at the substation A actuates hisswitchhook 1 by removing the receiver, then a circuit is completed forthe line relay 2 to thereby actuate the line lamp 3. This circuit passesthrough the windings of the differential relay 4 which however does notactuate its armature 5 on account of the dif ferential nature of thesewindings. The insertion of the plug 6 causes an actuation of the relay 7by way of the grounded winding of the relay 4, thus destroying thebalance and causing it to attract its armature 5, thereby extinguishingthe lamp 3 and energizing the relay 8. Thereupon relay 9 is operatedalso over the grounded winding of the relay 4:, thus establishing ashunt circuit about the relay 7 and permitting it to release itsarmature. The relay 9 looks itself in position by way of the contactspring 10 as is clear. The operation of the relay 9 connects theoperators set 11 to the strands of the cord circuit. The operator is nowin a position to test the called line through the use of the plug 12without actuating any key or other manual apparatus. This test circuitcan be traced from the tip of the plug through the upper winding ofrelay 13, by way of the contact spring 14, conductor 15, to theconnection between magnet 16 and high resistance tertiary winding whichwinding is of high enough resistance to prevent operating relay 13. Thetest circuit is thus completed by way of one winding of the relay 13,which relay 13 subsequently serves the purpose of disconnecting certaincord circuit instrumentalities when the calling plug is inserted. Therelay thus serves a dual purpose as will appear from the furtherdescription.

If the line extending to the s Ibstation B is idle, the operator insertsthe plug'12, thus energizing the relay 13, the circuit of said relaybeing completed by way of the grounded winding of the differential relay18 of the called line, including in this circuit also the magnet 16 andthe battery 17. The relay 13 thereupon locks itself in position throughthe battery 20 and the spring 141- by way of the winding of the relay 18as will be clear. The operation of the relay 13 disconnects theoperators set as will be apparent. Actuation of the ringing key on thepart of the operator momentarily actuates the end springs 21 of saidringing key, thereby closing a circuit for the relay 22 over thegrounded spring 28. The actuation of the springs 21 also operates themeter 24:. Relay 22 locks in its energized condition by way of thegrounded spring 23. The operation of the relay 22 causes an actuation ofthe relay 32 whereby intermittent ringing current is sent out over thecalled line b I the interrupter 25. Upon the response oi the calledsubscriber at the substation B, rela 2G is actuated by way of thegrounded winc ing of the differential relay 18. The opera: tion of therelay 26 causes a restoration of the relay 22, thereupon causing arestoration of the relay 82, thus disconnecting the ringing circuit fromthe called line. Upon completion-of the conversation, the restoration ofthe subscribers apparatus at substation E causes a restoration of therelay 26 to thereby actuate the supervisory lamp 27 over the groundedcontact spring 23. hen the calling subscriber at the station A restores,the supervisory signal 28 is actu ated likewise over the grounded spring23, due to the restoration of the relay 8. A restoration of the switchhook 1 at the substation A also causes an actuation of the relay 29 byway of the grounded contact spring 23 due to the restoration of therelay 8. The relay 29 upon energizing locks the relay 9 in position overthis same grounded spring 23. These two relays thus remain energizeduntil the plug 12 is finally withdrawn from the jack. The actuation ofthe relay 29 disconnects the plug 6 entirely from the cord circuit atthe contact springs 30 and 31 so that the calling line A after ther'cstora'tionof the switchhook 1 is entirely free upon asubsequentreactuation of said switchhook to actuate the line lamp 3 eventhough the plug 6 may remain within the jack of the said calling line A.From the above description it will be ap parent that I am enabled toaccomplish the instantaneous disconnect and recall features with a twoconductor cord circuit, and also in connection with a line circuit inwhich the line apparatus is controlled by the tip of the plug instead ofthe sleeve, providing at the same time the necessary test conditionswithout the actuation of the manual switch element other than the plug;The adaptability of my invention to other circuits will be clear. v

Having however thus described one form which my invention may take, whatI claim as new and desire to secure by Letters Patent is:

1. A telephonesystem comprising a telephone line having a line relay anda differentially wound cut-off relay, an operator controlled linkcircuit having a manual con nection terminal for connecting with saidline, said cut-off relay being controlled by said terminal, and meanscontrolled at the substation of said line for operatively disassociatingsaid link circuit from said line.

2. A telephone system comprising a telephone line having a line relayanda differenti ally wound cut-0E relay, an operator controlled linkcircuit having a manual connection terminal for connecting with saidline, said cut-off relay being operated through only one of its windingsand the tip contact of said terminal, and means controlled at thesubstation of said line for operatively, disassociating said linkcircuit from said line, said means including a disconnect relayassociated with said cord circuit controlled when said cord circuit isassociated with said line by the restoration to normal of the substationapparatus of said line.

3. A telephone system comprising telephone lines having line and cut-offrelays, jacks forsaid lines having tip and sleeve terminals, the cutoffrelays having theirini tial operating circuits connected to the tipterminal of their respective jacks, an operators cord circuit forconnecting two said jacks, a source'of energizing current for saidcut-off 'relay connected to the tip conductor of the cord through asingle wound relay, an operato'rs telephone, and means controlled bysaid single wound relay for connecting said operators telephone to saidcord circuit, a supervisory control relay connected to the sleeveconductorof the cord and controlled over a connected line, and a linkdisconnect relay *for eperatively dis associating said cord from theconnected line operated by saidsleeve supervisory re relay when the linecircuit is interrupted when disconnection is desired.

4. 'A'telep'hone system comprising a twoconductor subscribenslinecircuit, a cut-off relay for said subscribers line normally connected tosaid conductors, subscriber controlled means for closing a circuitthrough the windings of said cut-off relay in series, an operatorcontrolled link circuit for connecting with said line circuit, meansresponsive to the connection of said link circuit to said line circuitfor opening the said circuit for said cut-off relay and for closing asubstitute circuit for one winding 'the said cut-oil relay therebyeffectively energizing the same, and means controlled at the substationof said line for operatively disassociating said link circuit from saidline.

6. A telephone system comprising a twoconductor subscribers linecircuit, a double wound cut-off relay for said line circuit having itswindings normally connected to opposite ones of said conductors,anoperator controlled link circuit provided with a manual connectionterminal for connecting to said line circuit, means responsive to saidconnection for energizing said cut-off relay through the tipcontactof'said manual ter-,

minal, and a disconnect relay for said link circuit controllable by thesubscriber at the substation of said line for operatively disassociatingsaid link circuit from said line circuit.

7. A telephone system comprising a telephone line, a differentiallywound cutoii relay for said telephone line, an operator controlled linkcircuit provided with a terminal for connecting with said telephoneline, means responsive to such connection for operatively energizingsaid cut-off relay and means controlled at the substation of said linefor operatively disassociating said link circuit from said line wherebysaid line may recall before said terminal is disconnected from saidline.

8. A telephone system including a subscrib ers telephone line providedwith a line relay and a double wound cut-oil relay, a link circuitprovided with a connection terminal for connecting with the said line, apair of relays connected to contacts of said terminal, means responsiveto the connection of said link circuit to said telephone line forenergizing one winding of said cut-01f relay and one of said last relaysin a series circuit, means controlled by said relay for substitutinganother relay in said series circuit with said cut-oft relays, and meanscontrolled at the substation of said line for operatively disassociatingsaid link circuit relays from said line whereby said cut-oil relayoperates to render said line relay operative to make recalls.

9. A telephone system comprising a telephone line having a line relayand a double wound cut-off relay, a link circuit provided with a manualconnection terminal for connecting with said line, means responsive tosuch connection for operatively energizing said double wound cutofl'relay by energizing only one of its windings thereby deenergizing saidline relay, contacts controlled by the energization of said cut-01frelay to open the circuit of its other winding, and means controlled atthe substation of said line for operatively disassociating said linkcircuit from said line.

10. A telephone system comprising a subscribers line, a line relay and acut-off relay each normally connected to a conductor of said subscribersline, means for including said line relay in series circuit with saidcutoil relay to signal for connection, a link cir cuit provided with amanual connection ter minal for connecting to said line, meansresponsive to such connection for operatively energizing said cut-offrelay thereby disconnecting said line relay from said line, andsubscriber controlled means for deenergizing said cut-off relay therebyagain connecting said line relay to said subscribers line.

11. A telephone system comprising a sub scribers line provided with aline relay and a differentially wound cut-off relay, a

link circuit provided with a connection terminal for connecting withsaid line, subscriber controlled means for energizing said line relay,means responsive to the connection of said terminal to said line foroperating said cut-off relay, and subscriber con trolled means fordeenergizing said cut-oil relay.

12. A telephone system comprising a subscribers line provided with adifi'erentially wound cut-off relay normally connected to atalking-conductor of said line, a line relay, a circuit including saidcut-off relay and line relay in series, operator controlled means foroperatively energizing said cut-off relay to disconnect said line relay,and subscriber controlled means for denergizing said outofi relay.

13. A telephone system including a subscribers line, a cutofl' relay anda line relay for said line, a circuit for said line relay including saidcut-off relay and, with the substation set of said line, a link circuitprovided with a connection terminal for connecting to said line, a localenergizing circuit for said cut-off relay controlled by said connectionof the terminal to the line, and subscriber controlled means foroperatively disassociating said line and link circuit by opening saidlast circuit.

14:. A telephone system including a subscribers line terminating inmultiple jacks at the exchange, a difl'erentially wound cutoli relaynormally connected to a conductor of said line and to a spring of saidjacks, a

till

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link circuit provided with a terminal for connection to said line, meansfor closing a circuit through the windings of said cut-oil relay, meansresponsive to such connection for unbalancing the windings of saidcut-oil relay to thereby cause an operative energizer tion of the same,and substation controlled means for deenergizing said relay.

15. A telephone system including a sub scribers line having oneof itsconductors normally connected directly to a contact of a spring jack, acut-off relay connected to said conductor, a line relay, a circuitincluding said cut-off relay and line relay in series, operatorcont-rolled means for energizing said cut-off relay to disconnect saidline relay, and subscriber controlled means for deenergizing saidcut-ofl relay.

16. A telephone system including a sub scribers telephone line, adifferential cut-off relay and a line relay for said line, a circuit forsaid line relay controllable over said telephone line and including thewindings of said cut-off relay, an operators link circuit provided witha 111211111211'CODHGCtlOll terminal for connecting to said line, anenergizing circuit for said cut-ofi' relay includuing one of itswindings and a contact of said manual connection terminal, and a relayfor said link circuit under substation control for breaking said lastcircuit.

17. A telephone system including a subscribers line, a double Woundcut-oh relay and aline relay for said line, subscriber controlledi'neans for closing a series circuit through the said cut-oil relay,operator controlled means for opening the circuit of one of the windingsof said cut-off relay to there by operatively energize the same, andsubscriber controlled means for afterward deeiiergizing "said cut-offrelay.

18. A telephone system including a subscribers line provided with acut-oil relay and a line relay, subscriber controlled means for closinga circuit through said cut-ofi' relay, operator controlled means forclosing a substitute circuit for said cut-off relay whereby the same isoperatively energized,

and subscriber controlled means for thereafter deenerg izi'ng saidcut-off relay.

Signed by me at Chicago, county of "Cook and State of Illinois, in thepresence of two witnesses.

I-IIRAM D. CURRIER.

GEORGE E. MUELLER, M. R. Roorrroun.

Copies of this patent may be obtained for fi've cents each, byaddressing the Commissioner of Patents,

Washington, D. G.

orrections in Letters Patent No. 1,306,804.

It is hereby certified that in Letters Patent No. 1,306,804, grantedJune 17, 1919, upon the application of Hiram D. Currier, of Chicago,Illinois, for an improvement in Telephone Systems Having InstantaneousDisconnect and Recall, errors appear in the printed specificationrequiring correction as follows: Page 2, line 104, claim 3, for the Wordtwo read to; page 3, line 117, claim 13, strike out the Word with; page4, line 27, claim 16, for the Word 'includuing read including; samepage, line 40, claim ,17, for the word afterward read afterwards; andthat the said Letters Patent should be read with these correctionstherein that the same may conform to the record of the case in thePatentOffice.

Signed and sealed this 30th day of September, A. D., 1919.

[SEAL] M. H. COULSTON,

Acting Commissioner of Patents. Cl. 17958.

